Elastomer composition and use thereof

Abstract

To provide an elastomer composition effectively reduced in odor of an elastomer resin such as a rubber material, and to provide a compact containing the elastomer composition and having reduced odor.SOLUTION: An elastomer composition contains an elastomer resin (A), and an odor removing catalyst (B) in which at least one kind of metal elements of groups 8-12 of the periodic table is carried by a porous carrier, and has the content of the odor removing catalyst (B) of 0.01-10 mass%.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to an elastomeric composition having reduced odor and its uses. [Background technology]

[0002] Elastomer resins such as rubber materials can be molded into desired shapes and have elasticity and flexibility, and when crosslinked, they also have appropriate rigidity, making them widely used in a variety of applications, including building materials, everyday items, automotive interior and exterior components, vehicle and ship components, tire materials, shoe soles, hose materials, and electrical wire coating materials. Rubber materials are prone to emitting odors when they contain crosslinking agents such as sulfur or various additives, and can also emit odors due to volatile components, so controlling the odors emitted into the environment from rubber materials can be a challenge depending on the application.

[0003] Techniques for reducing the odor of rubber materials include a method of reducing volatile components by degassing, a method of adding fragrances, and a method of blending a deodorant, but the method of reducing volatile components by degassing is not effective enough in reducing odor, and the method of adding fragrances does not fundamentally reduce odor. As a method of blending a deodorant, for example, Patent Document 1 describes that a rubber composition with odor-inhibiting properties can be provided by adding rice husk ash containing 40% by mass or more of ash to a rubber component containing natural rubber, but this requires blending a relatively large amount of rice husk ash, which is a deodorant. Furthermore, photocatalyst TiO2 is known as a catalyst with odor-decomposing properties. Although this catalyst is in a form that can be kneaded into resin, it decomposes odors and also causes resin decomposition, so there was concern that if it was blended with a rubber component and used to manufacture molded products, the resulting molded products would deteriorate in a short period of time. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2023-071423 [Patent Document 2] Japanese Patent Application Publication No. 2023-032779 Summary of the Invention [Problem to be solved by the invention]

[0005] Meanwhile, the applicant of the present application has discovered that it is possible to provide a recycled plastic composition with reduced odor by blending a specific odor-removing catalyst with waste plastic resin (see Patent Document 2). However, since this technology achieves a reduction in odor intensity by blending a relatively large amount of odor-removing catalyst, 1 g per 10 g of waste plastic, it was predicted that when applied to rubber materials, a relatively large amount of odor-removing catalyst would need to be blended. An object of the present invention is to provide an elastomer composition in which the odor of an elastomer resin such as a rubber material is effectively reduced, and a molded article containing the elastomer composition and having little odor. [Means for solving the problem]

[0006] In light of the above-mentioned circumstances, the inventors conducted extensive research and discovered that when a specific odor removal catalyst is incorporated into an elastomer resin, excellent odor removal effects can be achieved even when the amount of odor removal catalyst incorporated is very small, leading to the completion of the present invention. The present invention relates to, for example, the following items [1] to [8].

[0007] [1] an elastomer resin (A); and an odor removal catalyst (B) in which one or more metal elements of Groups 8 to 12 of the periodic table are supported on a porous carrier; The elastomer composition has a content of the odor removing catalyst (B) of 0.01 to 10% by mass.

[0008] [2] The elastomer composition according to [1], wherein the elastomer resin (A) is a rubber material. [3] The elastomer composition according to [1] or [2], wherein the elastomer resin (A) is an ethylene-α-olefin-non-conjugated polyene copolymer rubber. [4] The elastomer composition according to any one of [1] to [3], wherein the odor removal catalyst (B) contains a metal element selected from Fe, Ru, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, and Au.

[0009] [5] The elastomer composition according to any one of [1] to [4], wherein the odor removing catalyst (B) contains Pt. [6] The elastomer composition according to any one of [1] to [5], further comprising sulfur or a sulfur compound as a crosslinking agent (C). [7] A molded article comprising the elastomer composition according to any one of [1] to [6]. [8] The molded article according to [7], which is an automotive component. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide an elastomer composition in which the odor of an elastomer resin such as a rubber material is effectively reduced, and a molded article with little odor. The present invention can provide an elastomer composition and a molded article with reduced odor even when the content of an odor removal catalyst is small. Therefore, according to the present invention, it is possible to economically provide an elastomer composition and a molded article with sufficiently reduced odor, while hardly impairing the mechanical properties inherent to the elastomer resin component. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a graph showing the odor intensity of the molded articles of Example 1 and Comparative Example 1. DETAILED DESCRIPTION OF THE INVENTION

[0012] Elastomer composition The elastomer composition of the present invention (hereinafter also referred to as the present composition) contains an elastomer resin (A) and an odor removal catalyst (B).

[0013] <Elastomer resin (A)> As the elastomer resin (A), any resin that has rubber elasticity when formed into a molded article or a cross-linked molded article can be used without any particular limitation. The elastomer resin (A) according to the present invention includes both rubber (thermosetting elastomer) and thermoplastic elastomer. Among the elastomer resins (A), examples of the rubber material (thermosetting elastomer) include ethylene-α-olefin-non-conjugated polyene copolymer rubber, butyl rubber, chloroprene rubber, natural rubber, isoprene rubber, nitrile rubber, styrene-butadiene rubber, butadiene rubber, chlorosulfonated polyethylene rubber, acrylic rubber, acrylonitrile-butadiene rubber, urethane rubber, hydrogenated acrylonitrile rubber, fluororubber, and silicone rubber. Among the elastomer resins (A), examples of the thermoplastic elastomer include polyolefin elastomers (olefin thermoplastic elastomers, TPV), styrene elastomers (TPS), urethane elastomers (TPU), ester elastomers (TPC, TPEE), polyvinyl chloride elastomers (TPVC), and amide elastomers (TPAE).

[0014] The elastomer resin (A) is preferably selected from rubber materials, more preferably ethylene-α-olefin-non-conjugated polyene copolymer rubber and butyl rubber, and particularly preferably ethylene-α-olefin-non-conjugated polyene copolymer rubber. It is also preferable that the elastomer resin (A) can be crosslinked using a crosslinking agent or the like. Using sulfur as a crosslinking agent or crosslinking aid is preferred because it can reduce the odor derived from sulfur. The elastomer resin (A) may be used alone or in combination of two or more kinds.

[0015] [Ethylene-α-olefin-non-conjugated polyene copolymer rubber] The ethylene-α-olefin-non-conjugated polyene copolymer rubber is a copolymer rubber containing structural units derived from ethylene, structural units derived from an α-olefin having 3 or more carbon atoms, preferably 3 to 20 carbon atoms, and structural units derived from a non-conjugated polyene.

[0016] The stereoregularity and chain structure of the ethylene-α-olefin-non-conjugated polyene copolymer rubber are not particularly limited, and the geometric chemistry (e.g., cis or trans) and stereochemistry of the non-conjugated polyene in the ethylene-α-olefin-non-conjugated polyene copolymer rubber are also not particularly limited.

[0017] The composition may contain two or more kinds of ethylene-α-olefin-non-conjugated polyene copolymer rubbers. Examples of the α-olefins having 3 to 20 carbon atoms include propylene, 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 1-nonene, 1-decene, 1-undecene, 1-dodecene, 1-tridecene, 1-tetradecene, 1-pentadecene, 1-hexadecene, 1-heptadecene, 1-octadecene, 1-nonadecene, 1-eicosene, 4-methyl-1-pentene, 9-methyl-1-decene, and 12-ethyl-1-tetradecene. Among these, α-olefins having 3 to 10 carbon atoms are preferred, with propylene, 1-butene, 4-methyl-1-pentene, 1-hexene, and 1-octene being more preferred, and propylene and 1-butene being particularly preferred. These α-olefins may be used alone or in combination of two or more.

[0018] Examples of the non-conjugated polyenes include linear non-conjugated dienes such as 1,4-hexadiene, 3-methyl-1,4-hexadiene, 4-methyl-1,4-hexadiene, 5-methyl-1,4-hexadiene, 4,5-dimethyl-1,4-hexadiene, 7-methyl-1,6-octadiene, 8-methyl-4-ethylidene-1,7-nonadiene, and 4-ethylidene-1,7-undecadiene; methyltetrahydroindene, 5-ethylidene-2-norbornene, 5-methylene-2-norbornene, and 5-isopropylidene-2-norbornene. , cyclic non-conjugated dienes such as 5-vinylidene-2-norbornene, 6-chloromethyl-5-isopropenyl-2-norbornene, 5-vinyl-2-norbornene, 5-isopropenyl-2-norbornene, 5-isobutenyl-2-norbornene, cyclopentadiene, and norbornadiene; trienes such as 2,3-diisopropylidene-5-norbornene, 2-ethylidene-3-isopropylidene-5-norbornene, 2-propenyl-2,2-norbornadiene, and 4-ethylidene-8-methyl-1,7-nonadiene. Among these, 1,4-hexadiene, 5-ethylidene-2-norbornene, 5-vinyl-2-norbornene, and a mixture of 5-ethylidene-2-norbornene and 5-vinyl-2-norbornene are preferred, and 5-ethylidene-2-norbornene, 5-vinyl-2-norbornene, and a mixture of 5-ethylidene-2-norbornene and 5-vinyl-2-norbornene are particularly preferred. These non-conjugated polyenes can be used alone or in combination.

[0019] The ethylene, α-olefin, and non-conjugated polyene, which are raw materials for the ethylene-α-olefin-non-conjugated polyene copolymer rubber, may be, for example, a fossil fuel-derived monomer or a biomass-derived monomer, and these monomers may be used alone or in combination of two or more.

[0020] The content of the structural units derived from ethylene in the ethylene-α-olefin-non-conjugated polyene copolymer rubber is preferably 55 to 99 mass%, more preferably 60 to 95 mass%, and even more preferably 70 to 90 mass%, relative to 100 mass% of the total of the structural units derived from ethylene and the structural units derived from the α-olefin.

[0021] The content of the structural units derived from the non-conjugated polyene in the ethylene-α-olefin-non-conjugated polyene copolymer rubber is preferably 1 to 25 parts by mass, more preferably 1 to 20 parts by mass, and even more preferably 3 to 15 parts by mass, per 100 parts by mass of the total of the structural units derived from ethylene and the structural units derived from the α-olefin. A specific example of a suitable ethylene-α-olefin-non-conjugated polyene copolymer rubber is ethylene-propylene-diene rubber (EPDM).

[0022] Manufacturing method for ethylene-α-olefin-non-conjugated polyene copolymer rubber The ethylene-α-olefin-non-conjugated polyene copolymer rubber can be produced using a known polymerization catalyst such as a Ziegler-Natta catalyst, a metallocene catalyst, etc. The polymerization method is not particularly limited, and can be a liquid phase polymerization method such as a solution polymerization method, a suspension polymerization method, or a bulk polymerization method, a gas phase polymerization method, or any other known polymerization method.

[0023] Commercially available ethylene-α-olefin-non-conjugated polyene copolymer rubber The ethylene-α-olefin-non-conjugated polyene copolymer rubber may be a commercially available product, and examples of the commercially available product include "Vistalon" manufactured by Exxon Mobil Chemical Company, "Esprene" manufactured by Sumitomo Chemical Co., Ltd., and "Mitsui EPT" manufactured by Mitsui Chemicals, Inc.

[0024] [Butyl rubber] The butyl rubber is a (co)polymer containing structural units derived from isobutylene (isobutene, 2-methylpropylene). The butyl rubber may be a homopolymer of isobutylene or a copolymer of isobutylene and a comonomer other than isobutylene.

[0025] When the butyl rubber is a copolymer of isobutylene and a comonomer other than isobutylene, the comonomer may be a diene compound, a styrene compound, or the like. These comonomers may be used alone or in combination of two or more. The stereoregularity and chain structure of the copolymer are not particularly limited.

[0026] The composition may contain two or more types of butyl-based rubbers. Examples of the diene compound include butadiene, isoprene, hexadiene, and chloroprene.

[0027] Examples of the styrene-based compound include styrene, α-methylstyrene, 3-methylstyrene, and 4-methylstyrene. Of these, isoprene and 4-methylstyrene are preferred.

[0028] The content of structural units derived from isobutylene in the butyl rubber is preferably 85 to 99.8% by mass, more preferably 90 to 99.5% by mass, and even more preferably 92 to 99.5% by mass, relative to 100% by mass of the total of structural units derived from isobutylene and structural units derived from comonomers other than isobutylene.

[0029] The butyl rubber may contain a halogen, preferably chlorine or bromine, and more preferably bromine. The halogen content in the halogen-containing butyl rubber is preferably 0.1 to 5 mass %, more preferably 0.3 to 3 mass %, relative to 100 mass % of the total butyl rubber.

[0030] The butyl rubber may be a butyl rubber obtained by further secondary modification of a halogen-containing butyl rubber. That is, the butyl rubber includes butyl rubber (isobutylene-isoprene copolymer, IIR), chlorinated butyl rubber (chlorinated butyl rubber, Cl-IIR), brominated butyl rubber (brominated butyl rubber, Br-IIR), and brominated isobutylene-4-methylstyrene copolymer.

[0031] -Butyl rubber manufacturing method The method for producing the butyl rubber is not particularly limited, but for example, there is a method in which a monomer containing isobutylene is cationic polymerized at low temperature in chloromethane using aluminum chloride as an initiator.

[0032] The method for introducing a halogen into the butyl rubber is not particularly limited, and any conventionally known method can be used, such as a method of copolymerizing a halogenated monomer, a method of modifying a halogen-free butyl rubber and introducing a halogen. A common method is to introduce a halogen into a butyl rubber using a simple halogen such as chlorine or bromine in a hydrocarbon solvent such as hexane.

[0033] Commercially available butyl rubber As the butyl-based rubber, commercially available products may be used. Commercially available butyl rubber (IIR) includes, for example, "Butyl" manufactured by Japan Butyl Co., Ltd., "Exxon butyl rubber" manufactured by Exxon Mobil Chemical Company, and "X_Butyl RB" manufactured by Lanxees.

[0034] Commercially available chlorinated butyl rubber (Cl-IIR) includes, for example, "CHLOROBUTYL" manufactured by Nippon Butyl Co., Ltd., "Exxon chlorobutyl rubber" manufactured by Exxon Mobil Chemical Company, and "X_Butyl CB" manufactured by Lanxess.

[0035] Commercially available brominated butyl rubber (Br-IIR) includes, for example, "BROMOBUTYL" manufactured by Nippon Butyl Co., Ltd., "Exxon bromobutyl rubber" manufactured by Exxon Mobil Chemical Company, and "X_Butyl BB" manufactured by Lanxess. An example of a commercially available brominated isobutylene-4-methylstyrene copolymer is "Exxpro" manufactured by Exxon Mobil Chemical Company.

[0036] [Other Aspects of Elastomer Resin (A)] As the elastomer resin (A), the above-mentioned elastomeric resin such as rubber may be used as it is, or a modified resin to which a substituent, a polar group, etc. is added may be used. The modified resin may be one type or two or more types.

[0037] The modification method is not limited, and various known modification methods can be used. Examples of the modification method include oxidation reaction with oxygen or peroxide, reactions starting from a carboxyl group such as hydrolysis, saponification, esterification, and amidation, reactions with simple halogens such as chlorine and bromine, nucleophilic substitution and nucleophilic elimination reactions at a (pseudo) alkyl halide moiety with good elimination ability, and graft modification in which a vinyl compound or the like is reacted in the presence of a radical initiator.

[0038] <Odor Removal Catalyst (B)> The odor removal catalyst (B) according to the present invention is an odor removal catalyst in which one or more metal elements of Groups 8 to 12 of the periodic table are supported on a porous carrier.

[0039] Porous carrier The porous carrier constituting the odor removal catalyst (B) is capable of supporting a metal component consisting of one or more metal elements of Groups 8 to 12 of the periodic table, and examples thereof include oxide-based carriers such as zeolite, alumina, silica, silica-alumina, titania, etc., and activated carbon-based carriers, etc. Of these, oxide-based carriers are preferred, and composite oxide carriers are more preferred. The composite oxide support is not particularly limited as long as it can support a metal component, and examples thereof include calcium titanate, aluminum silicate, magnesium aluminate, etc. Among these, zeolite (crystalline aluminosilicate) is preferred.

[0040] When the composite oxide support is a zeolite, for example, one having a silica / alumina ratio (SiO2 / Al2O3 (mol / mol)) of 3000 or less can be used without any particular restrictions. Such zeolite may be a natural zeolite or a synthetic zeolite, and its skeletal structure is not particularly limited, but synthetic zeolite is preferred because of its excellent homogeneity, and MFI type zeolite (ZSM-5 zeolite) is more preferred because it provides high deodorizing properties.

[0041] The silica / alumina ratio (SiO2 / Al2O3 (mol / mol)) of the zeolite is usually 3000 or less, and in a suitable embodiment is 50 or more and 3000 or less, preferably 100 or more and 2500 or less, more preferably 500 or more and 2000 or less, and even more preferably 1000 or more and 1500 or less. In another suitable embodiment, the silica / alumina ratio (SiO2 / Al2O3 (mol / mol)) is 50 or less, preferably 45 or less, more preferably 40 or less, and even more preferably in the range of 20 to 30. When the silica / alumina ratio of the zeolite is in such a range, it is preferable because it has an excellent effect of adsorbing odorous substances and the like.

[0042] Such zeolites may be synthesized or commercially available. Suitable commercially available zeolites include, for example, HSZ 891HOA (MFI type zeolite, H-ZSM-5, silica / alumina ratio (SiO2 / Al2O3 ratio (mol / mol)): 1500, average particle size: 4 μm) manufactured by Tosoh Corporation, CZP 90 (MFI type zeolite, H-ZSM-5, silica / alumina ratio (SiO2 / Al2O3 ratio (mol / mol)): 80 to 100) and CZP 200 (MFI type zeolite, H-ZSM-5, silica / alumina ratio (SiO2 / Al2O3 ratio (mol / mol)): >200) manufactured by Clariant, and HSZ (H-ZSM-5) manufactured by Tosoh Corporation. Examples include 822HOA (MFI type zeolite, H-ZSM-5, silica / alumina ratio (SiO2 / Al2O3 ratio (mol / mol)): 23)), Mizusawa Chemical Industries' Mizuka Sieves EX122, Silton MT-100, MT-400, and MT-8000.

[0043] The average particle size of each composite oxide support is more preferably in the range of 10 nm to 20 μm, and particularly preferably in the range of 10 nm to 10 μm.

[0044] Metallic elements (metallic components) in groups 8 to 12 of the periodic table In the odor removal catalyst (B) according to the present invention, one or more metal elements (metal components) of Groups 8 to 12 of the periodic table are supported on a porous carrier. The supported metal components are metal elements of Groups 8 to 12 of the periodic table, such as Fe, Ru, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, and Cd, and preferably one or more of Fe, Ru, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, and Au.

[0045] The metal component may contain one or more metal elements from Groups 8 to 12 of the periodic table, and preferably contains Pt (platinum). That is, the odor removal catalyst (B) according to the present invention preferably supports one or more metal components including Pt. Specifically, the metal component may be Pt alone, or Pt and a metal element other than Pt may be supported on the porous support. When the metal component includes Pt and a metal element other than Pt, examples of the metal element other than Pt include Re, Fe, Ru, Co, Rh, Ir, Ni, Pd, Cu, Ag, and Au. The supported metal species may be Pt alone or a combination of Pt and another metal, preferably Pt alone or a combination of Pt and at least one selected from Re, Fe, Ru, Co, Rh, Ir, Ni, Pd, Cu, Ag, and Au. The proportion of Pt in all supported metal elements (total of Pt and other metals) is usually 1 mol % or more, and preferably 10 mol % or more.

[0046] The amount of metal components in the odor removal catalyst (B), calculated as the metal amount of all metal components, is usually in the range of 0.01 to 10 mass%, preferably 0.01 to 5 mass%, more preferably 0.01 to 3 mass%, and even more preferably 0.05 to 1 mass%. When the amount of supported metal components is in this range, a sufficient odor removal effect can be achieved, which is preferable. The amount of metal components in the elastomer composition, calculated as the metal amount of all metal components, is usually in the range of 0.00001 to 0.005% by mass, and preferably 0.0001 to 0.003% by mass. When the amount of supported metal components is in this range, a sufficient odor removal effect can be achieved, which is preferable. In the present invention, the amount of metal components in the odor removal catalyst (B) and the elastomer composition refers to the amount of metal components of Groups 8 to 12 of the periodic table supported on the porous carrier, and does not include Al (Group 13 of the periodic table) and the like that constitute the porous carrier. The odor removing catalyst (B) according to the present invention may be one type alone or a combination of two or more types.

[0047] Manufacturing method of odor removal catalyst (B) As a method for producing the odor removal catalyst (B) according to the present invention, any method for supporting the metal element component of Groups 8 to 12 of the periodic table on the porous carrier can be used without any particular limitation.

[0048] Examples of methods for producing the odor removal catalyst (B) include a method in which a metal, metal compound, or mixture thereof from Groups 8 to 12 of the periodic table is supported on a porous support such as a composite oxide by impregnation, physical mixing, ion exchange, pore filling, or the like, and then reduced as needed. A preferred method is to impregnate a porous support with a solution or dispersion of the metal compound, dry it as needed, and then reduce it.

[0049] When the metal component contains Pt, examples of Pt compounds used for impregnation include platinum chloride, platinum oxide, platinum nitrate, dinitrodiamine platinum, platinum acetate, and platinum oxalate. Compounds of other metals include metal salts and metal oxides. Furthermore, when multiple metals are supported, the metal compound used for impregnation may be a double salt containing multiple metals.

[0050] The reduction of metal compounds supported by impregnation can be carried out by, for example, a reduction method by thermal decomposition, a reduction method using a gaseous reducing agent such as hydrogen or carbon monoxide, or a reduction method using a liquid reducing agent such as ethanol, methanol, hydrazine, or sodium borohydride. Furthermore, by using a liquid-phase reduction method, the support and reduction of the metal component on the porous support can be carried out simultaneously. The support and reduction of the metal compound can be carried out in a single operation, or can be repeated multiple times.

[0051] The odor removal catalyst (B) of the present invention has an excellent deodorizing effect and can suitably reduce or remove odorous substances such as aldehydes, carboxylic acids, and esters, odorous substances derived from volatile components in the aforementioned elastomeric resin (A), odorous substances derived from crosslinking agents and additives, odorous substances generated during the preparation and molding processes of the present composition, etc. Specifically, at least a portion of the surrounding odorous substances that come into contact with the odor removal catalyst of the present invention are decomposed, resulting in the reduction or removal of the odorous substances.

[0052] The odor removal catalyst (B) of the present invention is unlikely to release odorous substances and diffuse odors even when exposed to high temperatures, and since the adsorbed odorous substances are decomposed and diffused, its adsorption ability does not decrease significantly, allowing it to be used for deodorization for a long period of time. Therefore, even during mixing with the elastomer resin (A), during the production of the present elastomer composition, which involves heating and melt-kneading, and during the production of molded articles, it can decompose and reduce odors without impairing its deodorizing performance, and it can also decompose and reduce odors that continue to be emitted from molded articles after production.

[0053] Furthermore, the odor removal catalyst (B) of the present invention is less likely to cause decomposition of the elastomer resin (A), and therefore does not promote the decomposition of the elastomer resin in the composition or molded article, and can decompose and reduce the odor of the composition or molded article without impairing the inherent strength of the molded article obtained from the composition.

[0054] <Crosslinking agent (C)> The elastomer composition of the present invention may contain a crosslinking agent (C) in addition to the elastomer (A) and odor removal catalyst (B) described above. When the composition contains the crosslinking agent (C), a molded article obtained from the elastomer composition can be suitably crosslinked to form a crosslinked molded article. Examples of the crosslinking agent (C) include organic peroxides; sulfur such as powdered sulfur, precipitated sulfur, colloidal sulfur, surface-treated sulfur, and insoluble sulfur; sulfur compounds such as sulfur monochloride, sulfur dichloride, morpholine disulfide, alkylphenol disulfide, tetramethylthiuram disulfide, dipentamethylenethiuram tetrasulfide, and selenium dimethyldithiocarbamate; and metal compounds such as magnesium oxide, zinc oxide, and red lead.

[0055] Examples of organic peroxides include dicumyl peroxide, di-tert-butyl peroxide, di-tert-butylperoxy-3,3,5-trimethylcyclohexane, tert-butylcumyl peroxide, di-tert-amyl peroxide, tert-butyl hydroperoxide, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexyne-3, 2,5-dimethyl-2,5-di(benzoylperoxy)hexane, 2,5-dimethyl-2,5-mono(tert-butylperoxy)hexane, and and α,α'-bis(tert-butylperoxy-m-isopropyl)benzene; peroxyesters such as tert-butyl peroxyacetate, tert-butyl peroxyisobutyrate, tert-butyl peroxypivalate, tert-butyl peroxymaleate, tert-butyl peroxyneodecanoate, tert-butyl peroxybenzoate, and di-tert-butyl peroxyphthalate; and ketone peroxides such as dicyclohexanone peroxide.

[0056] Although the organic peroxide can be used as it is, due to handling issues, it is preferable to use a diluted product in which the organic peroxide is adsorbed on an inorganic filler such as calcium carbonate, or a masterbatch-type diluted product intended to suppress powdering during mixing and improve dispersibility in the polymer. The concentration of the organic peroxide in the diluted product is preferably 10 to 60% by mass, more preferably 20 to 50% by mass.

[0057] When the present composition contains an organic peroxide, the content of the organic peroxide is preferably 0.05 to 15 parts by mass, more preferably 0.1 to 10 parts by mass, per 100 parts by mass of the elastomer resin (A).

[0058] When the present composition contains sulfur or a sulfur compound, the content of sulfur or a sulfur compound is preferably 0.05 to 10 parts by mass, more preferably 0.1 to 5 parts by mass, per 100 parts by mass of the elastomer resin (A).

[0059] When an organic peroxide is used as the crosslinking agent (C), examples of the crosslinking aid include sulfur, sulfur compounds such as dipentamethylenethiuram tetrasulfide, quinone dioxime compounds such as p-quinone dioxime and p,p'-dibenzoylquinone oxime, and polyfunctional monomers. Examples of the polyfunctional monomer include (meth)acrylate compounds such as polyethylene glycol di(meth)acrylate, allyl compounds such as diallyl phthalate and triallyl cyanurate, maleimide compounds such as metaphenylene bismaleimide and toluylene bismaleimide, and divinylbenzene.

[0060] When sulfur or a sulfur compound is used as the crosslinking agent (C), examples of the crosslinking aid include sulfenamide compounds such as N-cyclohexyl-2-benzothiazole sulfenamide, N-oxydiethylene-2-benzothiazole sulfenamide, N-tert-butyl-2-benzothiazole sulfenamide, and N,N-diisopropyl-2-benzothiazole sulfenamide; 2-mercaptobenzothiazole, 2-(2,4-dinitrophenyl)mercaptobenzothiazole, 2-(4- Thiazole compounds such as (morpholinodithio)benzothiazole, 2-(2,6-diethyl-4-morpholinothio)benzothiazole, and dibenzothiazyl disulfide; guanidine compounds such as diphenylguanidine, triphenylguanidine, diorthotolylguanidine, orthotolylbiguanide, and diphenylguanidine phthalate; aldehydes such as acetaldehyde-aniline condensation product, butyraldehyde-aniline condensation product, hexamethylenetetramine, and acetaldehyde ammonia. amine or aldehyde-ammonia compounds; imidazoline compounds such as 2-mercaptoimidazoline; thiourea compounds such as thiocarbanilide, diethylthiourea, dibutylthiourea, trimethylthiourea, and diorthotolylthiourea; tetramethylthiuram monosulfide, tetramethylthiuram disulfide, tetraethylthiuram disulfide, tetrabutylthiuram disulfide, tetrakis(2-ethylhexyl)thiuram disulfide, and dipentamethylenethiuram tetrasulfide dithiocarbamates such as zinc dimethyldithiocarbamate, zinc diethyldithiocarbamate, zinc di-n-butyldithiocarbamate, zinc ethylphenyldithiocarbamate, zinc butylphenyldithiocarbamate, sodium dimethyldithiocarbamate, selenium dimethyldithiocarbamate, and tellurium dimethyldithiocarbamate; xanthates such as zinc dibutylxanthogenate; zinc oxide (zinc oxide); and fatty acids such as stearic acid.

[0061] When the present composition contains a crosslinking aid, the content of the crosslinking aid is preferably 0.1 to 20 parts by mass, more preferably 0.2 to 10 parts by mass, per 100 parts by mass of the elastomer resin (A).

[0062] <Other ingredients> The present composition may contain components other than the above-described elastomer resin (A), odor removal catalyst (B), and the above-described crosslinking agent (C) and crosslinking aid (hereinafter also referred to as "other components"), provided that the purpose of the invention is not impaired. Examples of other components include known additives typically added to rubber, such as softeners, plasticizers, fillers, flame retardants, tackifiers, colorants, foaming agents, foaming aids, lubricants, activators, reaction inhibitors, dispersants, UV absorbers, heat stabilizers, antioxidants, slip agents, and antioxidants. The present composition may also contain, as other components, resin components other than the elastomer resin (A).

[0063] Furthermore, the composition may contain other odor-removing components in addition to the odor-removing catalyst (B). While known odor-removing components can be used without limitation, physical adsorbents or chemical adsorbents are preferred. Examples of physical adsorbents include porous complex oxides and activated carbon. Examples of porous complex oxides include commercially available zeolites. Examples of commercially available chemical adsorbents include Toagosei's Kesmon NS-750 (organic amine-supported silica; for aldehydes), NS-70 (Ca, Mg-based compounds; for acids), NS-10 (zirconia phosphate; for ammonia), and NS-20C (Cu-based compound-supported silica; for sulfur compounds); Otsuka Chemical's Chemcatch (adipic acid dihydrazide; for aldehydes); and Sinase Zeomic's Dashlite S (amine compound-supported silica; for aldehydes).

[0064] When the present composition contains other odor-removing components other than the odor-removing catalyst (B) as other components, the ratio of the combination of the odor-removing catalyst (B) and other components such as physical adsorbents is not particularly limited as long as it exhibits a deodorizing effect. For example, it is preferable for the odor-removing catalyst (B) / odor-removing component ratio to be in the range of 90 / 10 to 30 / 70 (mass ratio), preferably 80 / 20 to 50 / 50 (mass ratio), as this provides an excellent adsorption effect for odorous substances, etc. The number of types of the other components may be one or more.

[0065] <Elastomer composition> The elastomer composition of the present invention contains the above-mentioned elastomer resin (A) and odor removal catalyst (B). The content of odor removal catalyst (B) in this composition is usually 0.01 to 10 mass%, preferably 0.01 to 5 mass%, more preferably 0.01 to 1 mass%, and particularly preferably 0.01 to 5 mass%. In the present invention, the odor removal catalyst (B) used has excellent odor removal performance and can be used for deodorization over a long period of time, so even with the above-mentioned small blending amount, this composition and the molded article or crosslinked molded article obtained therefrom have sufficiently reduced odor.

[0066] The present composition can be obtained by simultaneously or sequentially blending the elastomer resin (A), the odor removing catalyst (B), and, if necessary, other components, by a known method. The present composition may be any composition comprising components including an elastomer resin (A) and an odor removal catalyst (B), and may be prepared by simply mixing the components or by melt-kneading. Such a composition may be an uncrosslinked composition containing the components, or may be a composition in which at least a portion of the elastomer resin (A) among the components is crosslinked. A composition in which at least a portion of the elastomer resin (A) is crosslinked can be prepared by dynamically heat-treating an uncrosslinked composition. An example of a method for dynamic heat-treating is kneading in a molten state.

[0067] The dynamic heat treatment is preferably carried out in a non-open type apparatus, and preferably in an inert gas atmosphere such as nitrogen or carbon dioxide. Regarding the conditions for the dynamic heat treatment, the heat treatment temperature is preferably in the range of from the melting point of the elastomer resin (A) to 300°C, for example, 150 to 270°C, preferably 160 to 250°C. The kneading time is usually 1 to 20 minutes, preferably 1 to 10 minutes. The applied shear force, expressed as a shear rate, is usually 10 to 50,000 s -1 , preferably 100 to 10,000 s -1 The dynamic heat treatment can be preferably carried out when forming the compact.

[0068] The composition may be a simple mixture of the components, but it is preferable to prepare it by melt-kneading or to use it by melt-kneading during the production of molded articles, etc., as this makes it easier to achieve an odor-reducing effect. This effect is thought to be due to the fact that the odor-causing components in the composition come into contact with the odor-removing catalyst (B) in the composition when melt-kneaded or heated, and are decomposed or adsorbed.

[0069] <Molded body> The molded article of the present invention is a molded article containing the present composition described above. The molded article of the present invention can be obtained by molding the above-described present composition into the intended shape using various molding methods such as an extrusion molding machine, a calendar roll, a press molding machine, an injection molding machine, or a transfer molding machine. The molded article of the present invention may be an uncrosslinked molded article obtained by molding the uncrosslinked present composition, or a crosslinked molded article in which at least a portion of the elastomer resin (A) is crosslinked, but a crosslinked molded article is preferred. Crosslinking can be carried out by dynamic heat treatment (melt-kneading) during preparation or molding of the present composition, and / or by heat treatment or treatment with electron beams or the like on the molded article obtained by molding.

[0070] The crosslinking may be carried out by chemical crosslinking, which involves crosslinking by heating or the like using a crosslinking agent, or by radiation crosslinking, which involves crosslinking by irradiating with radiation such as electron beams, X-rays, γ-rays, α-rays, and β-rays, or both chemical crosslinking and radiation crosslinking may be carried out.

[0071] When the chemical crosslinking is carried out, it is preferable to use the above-mentioned crosslinking agent (the present composition containing the crosslinking agent). The chemical crosslinking is preferably carried out under heating, and the heating conditions in this case are not particularly limited, but preferably include heating at 160 to 200° C. for about 30 minutes to 2 hours.

[0072] When the radiation crosslinking is carried out, a crosslinking agent may or may not be used. When irradiating with electron beams, it is desirable to carry out so that the absorbed dose is preferably 0.5 to 100 kGy, more preferably 0.5 to 70 kGy.

[0073] When crosslinking is performed by electron beam irradiation, the step of irradiating with electron beams may be performed multiple times so that the absorbed dose per irradiation falls within the above range. Crosslinking may be performed using a mold or without a mold. When a mold is not used, the molding and crosslinking steps are usually performed continuously. Heating in the crosslinking bath can be performed using, for example, hot air, steam, a glass bead fluidized bed, UHF (ultra-high frequency electromagnetic waves), or LCM (molten salt bath).

[0074] The molded article of the present invention can be one in which odor is sufficiently suppressed due to the inclusion of the odor removal catalyst (B) in the composition. Generally, molded articles obtained by chemical crosslinking, particularly crosslinking using a sulfur-based crosslinking agent or crosslinking aid, often have a relatively strong odor. However, the molded article of the present invention can be one in which odor is sufficiently suppressed due to the inclusion of the odor removal catalyst (B) in the composition. Furthermore, even when a crosslinking agent is not included, odors due to volatile components, additives, etc. can be sufficiently suppressed. Furthermore, the molded article of the present invention can be one in which odors that continue to be emitted from the molded article after production are sufficiently suppressed.

[0075] The elastomer composition of the present invention and the molded article of the present invention can be used for any of the applications known for conventional elastomer resin compositions and molded articles thereof, without any limitations. Examples of such applications include automotive components such as interior and exterior automotive parts, vehicle and ship components, tire materials, building materials, everyday items, furniture materials, shoe soles, hose materials, and electrical wire coating materials. Furthermore, the molded article of the present invention has little odor, making it suitable for use in enclosed spaces. [Example]

[0076] The present invention will be explained in more detail below based on examples, but the present invention is not limited to these examples.

[0077] <Measurement and evaluation methods> Deodorizing evaluation (ISO12219-7 compliant sensory evaluation test for deodorizing) (Standard odor bag production method) ISO 12219-7 specifies the relationship between each odor intensity and the degree of odor as a sensory evaluation standard, dividing odor intensity into six levels from 1 to 6 (see Table 1 below). 50 ml of water / 1-butanol solutions for standard odors corresponding to each odor intensity were prepared according to Table 2 below. 10 L of dry, deodorized air was introduced into a 10 L sampling bag (deodorized Tedlar bag, manufactured by GL Sciences Inc.), 10 mL of water / 1-butanol solution corresponding to each odor intensity was added, the inlet valve was closed, and the bag was left to stand at room temperature for 2 hours, thereby preparing standard odors corresponding to odor intensities 1 to 6.

[0078] [Table 1]

[0079] [Table 2]

[0080] (How to create evaluation sample bags) A slit was made in the bottom of a 10L sampling bag (deodorized Tedlar bag, manufactured by GL Sciences Inc.) to allow 100cm of each evaluation sample to be placed inside. 2 The sample was placed in a sampling bag and heat-sealed. 5 L of dry deodorized air was introduced and the valve at the inlet was closed to create a sample bag for evaluation.

[0081] (Sensory evaluation test for deodorization) The evaluation sample bag was heated to 80°C, and the odor intensity after a specified time was compared to the standard odor bag by sniffing and rated in 0.5 increments. The evaluation was carried out by five panelists, and the average value was taken as the odor intensity of the evaluation sample. Variation was calculated using standard deviation. The evaluation results were shared after the 24-hour evaluation was completed.

[0082] Mooney Viscosity The Mooney viscosity of the elastomer resin component was measured by the Mooney viscosity test method according to ASTM D1646.

[0083] Polymer Composition The polymer composition of the elastomer resin component was determined by the method described in ASTM D3900 for the ethylene content and ASTM D6047 for the diene (ENB) content.

[0084] Vulcanization speed test The uncrosslinked copolymer composition in each example was heated at a predetermined crosslinking temperature in accordance with JIS K6300-2, and the following values ​​were determined from the crosslinking curve measured using an MDR2000 (manufactured by Alpha Technologies). "S'max" (dNm): The maximum torque value S'max. "S'min" (dNm): The minimum torque value S'min. "S'max-S'min" (dNm): The difference between the maximum torque value S'max and the minimum torque value S'min. TS1: The time taken for the torque value to increase by 1 (dNm) from the minimum torque value S'min, based on the start of measurement, under the condition of a temperature of 125°C. "170°C (tc90) minutes": The time required to reach a torque value equivalent to 90% of "S'max - S'min" based on the start of measurement under the condition of a temperature of 170°C.

[0085] Hardness test (Duro-A hardness) In accordance with JIS K 6253-3, the hardness (Type A durometer, HA) of the sheet-shaped molded product was measured using six 2 mm thick elastomer sheets produced in each example, stacked on their flat surfaces to a thickness of approximately 12 mm. However, test specimens containing foreign matter, bubbles, or scratches were not used. The dimensions of the measurement surface of the test specimen were such that measurements could be made with the tip of the indenter at least 12 mm away from the edge of the specimen.

[0086] Tensile Stress Test The elastomer sheets produced in each example were punched out to prepare No. 3 dumbbell test pieces as specified in JIS K 6251 (1993). Using these test pieces, tensile tests were carried out according to the method specified in JIS K 6251, paragraph 3, at a measurement temperature of 23°C and a tensile speed of 500 mm / min, and the tensile stress at break TB (MPa) was measured.

[0087] Compression set The uncrosslinked elastomer composition in each example was crosslinked by heating at 170°C for 15 minutes using a press molding machine equipped with a cylindrical mold, and a crosslinked body with a diameter of 29 mm and a height (thickness) of 12.5 mm was prepared as a test specimen in accordance with JIS K 6262. The test specimen was compressed by 25% of its height (12.5 mm) before applying a load, and placed together with the spacer in a gear oven at 120°C for 72 hours for heat treatment. The test specimen was then removed and left at room temperature for 30 minutes, after which the height of the test specimen was measured and the compression set (%) was calculated using the following formula: Compression set (%) = {(t0-t1) / (t0-t2)} x 100 t0: Height of the specimen before the test. t1: Height after the test piece is treated under the above conditions and left at room temperature for 30 minutes. t2: Height of the test specimen when attached to the measuring mold.

[0088] [Production Example 1] (Production of odor removal catalyst (B-1)) 0.05 g of hexachloroplatinic acid (IV) hexahydrate (Fujifilm Wako Pure Chemical Industries, Ltd.) was weighed and dissolved in 50 mL of distilled water. This solution was placed in a 200 mL eggplant-shaped flask, and 2.0 g of MFI-type zeolite (H-ZSM-5, Tosoh Corporation, HSZ891HOA, silica / alumina ratio (SiO2 / Al2O3 ratio (mol / mol)): 1500, average particle size: 5 μm) was added to impregnate the zeolite with the Pt compound solution to a concentration of 1% Pt by mass. The flask was then attached to an evaporator, and the water was evaporated at 80 °C under vacuum. The remaining powder was then recovered. The recovered powder was then heated to 200 °C at a rate of 5 °C / min under a 100% H2 flow and subjected to hydrogen reduction for 2 hours to obtain a Pt / zeolite catalyst. The obtained Pt / zeolite catalyst was crushed using a Super Jet Mill (SJ-500, manufactured by Nisshin Engineering) to prepare an odor removal catalyst (B-1) in which 1% by mass of Pt was supported on zeolite and the average particle size was 2 μm.

[0089] [Example 1] (Production of elastomer sheet (A-1)) Using an 8-inch roll, the components were kneaded in the compounding ratios shown in Table 3 to obtain elastomer compositions containing the odor removing catalyst. The kneading conditions were roll temperatures of front roll / rear roll = 50°C / 50°C, roll peripheral speeds of front roll / rear roll = 18 rpm / 15 rpm, roll gap of 3 mm, and kneading time of 8 minutes.

[0090] The components listed in Table 3 are as follows: EPDM1: Ethylene-propylene-5-ethylidene-2-norbornene (ENB) copolymer (elastomer resin A1), Mooney viscosity (ML(1+4)125℃)=43, ethylene content=65% by mass, ENB content=4.5% by mass, oil extension amount=20 phr EPDM2: Ethylene-propylene-ENB copolymer (elastomer resin A2), Mooney viscosity (ML(1+4)125℃)=57, ethylene content=61% by mass, ENB content=5.4% by mass "Suncerer M" (trade name): 2-mercaptobenzothiazole, manufactured by Sanshin Chemical Industry Co., Ltd., vulcanization accelerator "Suncerer TT" (trade name): Tetramethylthiuram disulfide, manufactured by Sanshin Chemical Industry Co., Ltd., vulcanization accelerator "Suncerer BZ" (trade name): Zinc dibutyldithiocarbamate, manufactured by Sanshin Chemical Industry Co., Ltd., vulcanization accelerator "Suncerer CM" (trade name): N-cyclohexyl-2-benzothiazole sulfenamide; manufactured by Sanshin Chemical Industry Co., Ltd., vulcanization accelerator "Sunfel R" (trade name): Morpholine disulfide, manufactured by Sanshin Chemical Industry Co., Ltd., vulcanization accelerator "Vesta BS" (product name): Defoaming agent manufactured by Inoue Lime Industry Co., Ltd.

[0091] Next, the obtained elastomer composition was vulcanized at 170°C for 10 minutes using a press molding machine to prepare an elastomer sheet (A-1) having a thickness of 2 mm. (Deodorizing evaluation) The resulting vulcanized molded product, elastomer sheet (A-1), was subjected to a sensory evaluation test for deodorization after 2 hours, 4 hours, and 24 hours according to the method described above, and the results are shown in the graph in Figure 1. In the graph in Figure 1, the error bars indicate the standard deviation σ. (Physical property evaluation) The obtained elastomer compositions and elastomer sheets were subjected to the vulcanization rate test, hardness test, tensile stress test, and compression set test according to the above-mentioned methods. The results are shown in Table 5.

[0092] [Comparative Example 1] An elastomer sheet (A'-1) not containing the odor elimination catalyst (B-1) was prepared in the same manner as in Example 1, except that the odor elimination catalyst (B-1) was not used, and a sensory evaluation test for deodorization was conducted, the results of which are shown in the graph of Figure 1. In the graph of Figure 1, the error bars indicate the standard deviation σ. In addition, physical property evaluation was conducted in the same manner as in Example 1, and the results are shown in Table 5.

[0093] [Table 3]

[0094] From the graph shown in Figure 1, it can be seen that in the vulcanized molded body made from the elastomer composition of Example 1 containing the odor removal catalyst of the present invention, despite the content of the odor removal catalyst being very small, the odor intensity was significantly reduced compared to the vulcanized molded body made from the elastomer composition of Comparative Example 1 which did not contain the odor removal catalyst, and the increase in odor over time was also suppressed.

[0095] [Production Example 2] (Production of odor removal catalyst (B-2)) 0.0292 g of hexachloroplatinic acid (IV) hexahydrate (Fujifilm Wako Pure Chemical Industries, Ltd.) was weighed and dissolved in 80 mL of distilled water to obtain a solution. This solution was placed in a 300 mL eggplant-shaped flask, and 11 g of MFI-type zeolite (H-ZSM-5, Tosoh Corporation, HSZ 891HOA, silica / alumina ratio (SiO2 / Al2O3 ratio (mol / mol)): 1500, average particle size: 4 μm) was then added to the eggplant-shaped flask. The platinum compound solution was impregnated into the zeolite to obtain a platinum (Pt) loading of 0.1 mass%. The eggplant-shaped flask was then attached to a rotary evaporator, and the water was evaporated under vacuum at 70 °C. The remaining powder was then recovered. The recovered powder was placed in an electric furnace and calcined in air at 400 °C for 12 hours to obtain a powdered calcined product.

[0096] Next, the powdered calcined body obtained by the calcination was subjected to hydrogen reduction using a catalyst analyzer BELCAT-B (manufactured by Microtrac-Bell Corporation) as a heating furnace. This catalyst analyzer includes an electric furnace, a cooling fan for the electric furnace, and a gas port capable of supplying various gases. First, the powdered calcined body was placed in a quartz tube, which was then set in the electric furnace portion of the catalyst analyzer. The powdered calcined body was then heated to 400°C at a rate of 10°C per minute under a helium gas flow, and then held at 400°C for 2 hours under a 5% hydrogen / argon gas flow. The calcined body was then cooled under a helium gas flow using the cooling fan attached to the catalyst analyzer (it took approximately 1 hour to cool from 400°C to 40°C). This hydrogen reduction was performed to prepare an odor removal catalyst (B-2), which was a 0.1% by mass Pt / zeolite catalyst.

[0097] [Production Example 3] (Production of odor removal catalyst (B-3)) The odor removal catalyst (B-2) prepared in Production Example 2 and MFI-type zeolite (H-ZSM-5, HSZ 891HOA manufactured by Tosoh Corporation, silica / alumina ratio (SiO2 / Al2O3 ratio (mol / mol)): 1500, average particle size: 5 μm) were uniformly mixed in a mass ratio of 6:4 to prepare odor removal catalyst (B-3).

[0098] [Production Example 4] (Production of odor removal catalyst (B-4)) An odor removal catalyst (B-4), which is a 1 mass% Pt / zeolite catalyst, was prepared in the same manner as in Production Example 1, except that the MFI-type zeolite used in Production Example 1 was changed to HSZ 822HOA (H-ZSM-5, manufactured by Tosoh Corporation, silica / alumina ratio (SiO2 / Al2O3 ratio (mol / mol)): 24, average particle size: 5 μm).

[0099] The odor removal catalyst (B-5) was MFI-type zeolite (H-ZSM-5, Tosoh Corporation, HSZ 891HOA, silica / alumina ratio (SiO2 / Al2O3 ratio (mol / mol)): 1500, average particle size: 5 μm).

[0100] [Examples 2 to 5, Comparative Example 2] (Production and evaluation of elastomer sheets) In the production of the elastomer sheet (A-1) of Example 1, the type and amount of odor removing catalyst added were changed so that the type and content of the odor removing catalyst would be as shown in Table 4. In Table 4, the amount of metal component refers to the amount of supported metal component (the metal element of Groups 8 to 12 of the periodic table supported on the porous support in the odor removing catalyst). The vulcanized molded elastomer sheets thus obtained were subjected to a sensory evaluation test for deodorizing effect after 24 hours according to the method described above. The results of the sensory evaluation are also shown in Table 4. Furthermore, for Examples 3 and 4, the physical properties were evaluated in the same manner as for Example 1, and the results are shown in Table 5. The results of the physical property evaluation shown in Table 5 indicate that the elastomer sheets of Examples 1, 3, and 4, which contained an odor elimination catalyst, all had the same vulcanization rate, hardness, and rubber properties (tensile stress at break and compression set) as Comparative Example 1, which did not contain an odor elimination catalyst, confirming that the properties of the elastomer were not impaired by the odor elimination catalyst.

[0101] [Table 4]

[0102] [Table 5]

[0103] [Production Example 5] (Production of Masterbatch (b-2)) 0.45 kg of the odor removal catalyst (B-2) obtained in Production Example 2 was dry-blended with 2.55 kg of polypropylene (Prime Polypro (registered trademark) J707G, manufactured by Prime Polymer Co., Ltd.) having a melt flow rate (MFR, 230°C) of 30 g / 10 min. The mixture was then kneaded at a kneading temperature of 200°C using a twin-screw extruder KZW15-30MG (screw diameter Φ=15 mm, L / D=30, manufactured by Technovel Co., Ltd.) and strand-cut to obtain 1.9 kg of pellets (masterbatch (b-2)) containing 15% of the odor removal catalyst (B-2).

[0104] [Production Example 6] (Production of Masterbatch (b-3)) In Production Example 5, except that the odor removal catalyst (B-3) obtained in Production Example 3 was used instead of the odor removal catalyst (B-2), 1.8 kg of pellets (master batch (b-3)) containing 15% odor removal catalyst (B-3) was obtained in the same manner as Production Example 5.

[0105] [Production Example 7] (Production of elastomer resin composition (A3)) 100 parts by mass of ethylene-propylene-5-ethylidene-2-norbornene copolymer (ethylene-derived structural units: 65% by mass, propylene-derived structural units: 30.4% by mass, non-conjugated diene-derived structural units: 4.6% by mass; Mooney viscosity [ML(1+4)125℃]: 61) with polypropylene (MFR(ASTM D1238-65T measurement method; 230°C, 2.16 kg load): 27 g / 10 min, melting point: 163°C) 104 parts by mass, softener (paraffinic process oil) 41 parts by mass, crosslinking agent (organic peroxide: 2,5-dimethyl-2,5-bis-(tert-butylperoxy)hexyne-3) 0.3 parts by mass, and crosslinking aid (divinylbenzene) 0.3 parts by mass were thoroughly mixed in a Henschel mixer, and the mixture was granulated in a twin-screw extruder to obtain pellets of thermoplastic elastomer resin composition (A3).

[0106] [Example 6] Using 100 parts by mass of the elastomer resin composition (A3) and 1.33 parts by mass of the masterbatch (b-2) obtained in Production Example 5 containing 15% of the odor removal catalyst (B-2), an elastomer sheet having a thickness of 0.5 mm was produced using a T-die molding machine (manufactured by Thermoplastic Kogyo Co., Ltd.) with cylinder temperatures of C1 to C4 = 220°C, A = 220°C, D1 to D3 = 220°C, cooling roll temperature: 20°C, and take-up speed: 0.5 m / min. The elastomer sheet obtained here was an elastomer composition consisting of an elastomer resin composition (A3) and a masterbatch (b-2) containing an odor removal catalyst (B-2), and the amount of supported metal components (metal elements of Groups 8 to 12 of the periodic table in the odor removal catalyst supported on a porous support) in the elastomer composition was 0.00020 mass%.

[0107] (sensory evaluation) 2 g of the prepared elastomer sheet was finely chopped, placed in a 20 ml glass vial, capped, heated at 80° C. for 2 hours, and then returned to room temperature to prepare an evaluation sample. The odor of the obtained evaluation samples was evaluated by two panelists, who scored the odor intensity using the rating scale shown in Table 6. The average of the two panelists' scores was used as the evaluation result. The results are shown in Table 7.

[0108] [Examples 7 to 11, Comparative Example 3] In the production of the elastomer sheet of Example 6, the type and amount of the masterbatch containing the odor removing catalyst were changed as shown in Table 7, and an elastomer sheet was produced in the same manner as in Example 6, and a sensory evaluation was performed. The results are also shown in Table 7.

[0109] [Table 6]

[0110] [Table 7]

Claims

1. an elastomer resin (A); and an odor removal catalyst (B) in which one or more metal elements of Groups 8 to 12 of the periodic table are supported on a porous carrier; The elastomer composition has a content of the odor removal catalyst (B) of 0.01 to 10 mass %.

2. The elastomer composition according to claim 1 , wherein the elastomer resin (A) is a rubber material.

3. 2. The elastomer composition according to claim 1, wherein the elastomer resin (A) is an ethylene-α-olefin-non-conjugated polyene copolymer rubber.

4. 2. The elastomer composition according to claim 1, wherein the odor removal catalyst (B) contains a metal element selected from Fe, Ru, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, and Au.

5. The elastomeric composition of claim 1 , wherein the odor removal catalyst (B) comprises Pt.

6. The elastomeric composition of claim 1, further comprising sulfur or a sulfur compound as a crosslinking agent (C).

7. A molded article comprising the elastomer composition according to any one of claims 1 to 6.

8. The molded article according to claim 7, which is an automobile component.

Images